|
Concentrations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Jan. 31, 2014
Customer
|
Jan. 31, 2013
Customer
|
|
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Minimum rate of consolidated accounts receivable | 10.00% | 10.00% |
| Foreign bank deposits | $ 14,074 | |
| Number of suppliers manufacture land based seismic systems and equipment in use | 2 | |
|
Credit Risk [Member]
|
||
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Concentration risk number Of customer | 1 | 3 |
|
One Major Customer [Member] | Credit Risk [Member]
|
||
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Aggregate amount of accounts receivable from customers | 3,102 | |
|
Three Major Customer [Member] | Credit Risk [Member]
|
||
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Aggregate amount of accounts receivable from customers | $ 9,591 | |